lesson 6 Flashcards
What are viruses?
tiny organic forms between living cells and organic compounds
Viruses are smaller than bacteria - true or false
true
Which microscope/magnification must be used to see viruses?
- electron microscope
- 1000000 x
True or false - viruses can reproduce in the food
false
What can viruses cause?
- influenza
- mumps
- measles
- smallpox
- cold
- poliomyelitis
- encephalitis
How do viruses multiply?
They use our cells to duplicate themselves
2 most common types of viruses in food industry
- Hepatitis A (liver)
- Noroviruses
What are parasites?
Organisms that live in or on other organisms without benefiting the host
2 most common parasites in food industry
- Anisakid worm (fish) -> anisakiasis
- trichinella spiralis (pork)
How to prevent anisakiasis
-freeze fish for 15 hours at -31 F
What is yeast?
- one celled organism
- bigger than bacteria
What does yeast require for proper growth?
- warmth
- moisture
- food
- air
What is the result of yeast acting on sugar?
- carbon dioxide
- alcohol
Why is the production of alcohol used by yeast limited to 18%?
yeast killed at this concentration of alcohol
What is the process called by which yeast reproduces?
budding
